Roche, D., and A. Murphy. “‘Steeple sign’ in PHACE Syndrome”. European Journal of Pediatric Dermatology 31, no. 2 (May 28, 2021): 113–114. Accessed September 9, 2026. https://ejpd.migration.pkpps03.publicknowledgeproject.org/index.php/journal/article/view/2246.